Stackable Hot Wheels Parking

I wanted to display some diecast cars without taking up a lot of space. I liked a few designs I saw here, but they weren't quite right for what I wanted. This stackable rack can hold a variety of sizes and display them pretty clearly. My stack is 5 levels high and pretty sturdy.
There is a file without posts for the top, and a variation of that which leaves one post in the back to display the Hot Wheels sign.